Power setting changes itself.

I've been having this trouble on my laptop where the power setting just changes at will. I usually put it at power saving when i use it to write but it just takes 10-20 seconds before it by itself changes to High performance. Its been doing this all day today, does anyone know why it would be doing this?

Welcome to the forums!
Just a few things I found on the net you can explorer:

1. Everytime I run a hd tune benchmark on my hdd, it changes the power settings.

2. Make sure you're changing the plan the correct way: Power Plan Settings - Change - Windows 7 Forums

3. I turned off wake on lan in bios and all is good.

4. Power Options and sleep mode settings resetting at random. - Microsoft Answers